Polaris Sportsman 570 Owner's Manual For Maintenance And Safety page 105

Engine Oil
Oil Recommendations
Always change the oil filter whenever changing oil.
POLARIS recommends the use of POLARIS PS-4 Full Synthetic 5W-
50 4-cycle oil or a similar oil for this engine. Oil may need to be
changed more frequently if POLARIS oil is not used. Always use 5W-
50 oil. Follow the manufacturer's recommendations for ambient
temperature operation. See page 170 for the part numbers of POLARIS
products.
NOTICE: Mixing brands or using a non-recommended oil may cause serious
engine damage. Always use the recommended oil. Never substitute
or mix oil brands.
MAINTENANCE
103